BITE ALARMS: (9) Collection of classic and vintage electric bite alarms incl. a rare Dick Walker Nightjar electric Bite Alarm, Buzzer Box and Bite Detector, in MOB, pair of original Heron bite detectors in MOB, PDQ bite alarm in MOB, the B.J. electronic extension buzzer in MOB, Rolon bite alarm with box and papers, a Beacon indicator and 2 others with extension box.